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  <div class="section" id="cryptographic-services">
<span id="crypto"></span><h1>15. Cryptographic Services<a class="headerlink" href="#cryptographic-services" title="永久链接至标题">¶</a></h1>
<p id="index-0">The modules described in this chapter implement various algorithms of a
cryptographic nature.  They are available at the discretion of the installation.
On Unix systems, the <a class="reference internal" href="crypt.html#module-crypt" title="crypt: The crypt() function used to check Unix passwords. (Unix)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">crypt</span></code></a> module may also be available.
Here's an overview:</p>
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<li class="toctree-l1"><a class="reference internal" href="hmac.html">15.2. <code class="docutils literal notranslate"><span class="pre">hmac</span></code> --- Keyed-Hashing for Message Authentication</a></li>
<li class="toctree-l1"><a class="reference internal" href="secrets.html">15.3. <code class="docutils literal notranslate"><span class="pre">secrets</span></code> --- Generate secure random numbers for managing secrets</a><ul>
<li class="toctree-l2"><a class="reference internal" href="secrets.html#random-numbers">15.3.1. Random numbers</a></li>
<li class="toctree-l2"><a class="reference internal" href="secrets.html#generating-tokens">15.3.2. Generating tokens</a><ul>
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<li class="toctree-l2"><a class="reference internal" href="secrets.html#other-functions">15.3.3. Other functions</a></li>
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